Segment Information - Reconciliation of Assets from Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Depreciation	$ 10,332	$ 11,006
Amortization	2,143	2,273
Capital expenditures	11,384	12,570
Pursuit
Segment Reporting Information [Line Items]
Depreciation	8,134	7,782
Amortization	1,161	1,179
Capital expenditures	7,727	11,491
Spiro
Segment Reporting Information [Line Items]
Depreciation	500	929
Amortization	63	52
Capital expenditures	647	144
GES-Exhibitions
Segment Reporting Information [Line Items]
Depreciation	1,678	2,291
Amortization	919	1,042
Capital expenditures	3,008	865
Corporate And Other
Segment Reporting Information [Line Items]
Capital expenditures	2	70
Corporate
Segment Reporting Information [Line Items]
Depreciation	$ 20	$ 4

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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